function withData(param) {
  return param < 10 ? '0' + param : '' + param;
}
function getLoopArray(start, end, ch) {
  var start = start || 0;
  var end = end || 1;
  var array = [];
  for (var i = start; i <= end; i++) {
    array.push(withData(i) + ch);
  }
  return array;
}
function getMonthDay(year, month) {
  var flag = year % 400 == 0 || (year % 4 == 0 && year % 100 != 0), array = null;

  switch (month) {
    case '01':
    case '03':
    case '05':
    case '07':
    case '08':
    case '10':
    case '12':
      array = getLoopArray(1, 31, '日')
      break;
    case '04':
    case '06':
    case '09':
    case '11':
      array = getLoopArray(1, 30, '日')
      break;
    case '02':
      array = flag ? getLoopArray(1, 29, '日') : getLoopArray(1, 28, '日')
      break;
    default:
      array = '月份格式不正确，请重新输入！'
  }
  return array;
}
function getNewDateArry() {
  // 当前时间的处理
  var newDate = new Date();
  var year = withData(newDate.getFullYear()),
    mont = withData(newDate.getMonth() + 1),
    date = withData(newDate.getDate()),
    hour = withData(newDate.getHours()),
    minu = withData(newDate.getMinutes()),
    seco = withData(newDate.getSeconds());

  return [year, mont, date, hour, minu, seco];
}
function dateTimePicker(startYear, endYear, date) {
  // 返回默认显示的数组和联动数组的声明
  var dateTime = [], dateTimeArray = [[], [], [], [], []];
  var start = startYear || 1978;
  var end = endYear || 2100;
  // 默认开始显示数据
  
  var defaultDate = date ? [...date.split(' ')[0].split('-'), ...date.split(' ')[1].split(':')] : getNewDateArry();
  // 处理联动列表数据
  /*年月日 时分秒*/
  dateTimeArray[0] = getLoopArray(start, end, '年');
  dateTimeArray[1] = getLoopArray(1, 12, '月');
  dateTimeArray[2] = getMonthDay(defaultDate[0], defaultDate[1]);
  dateTimeArray[3] = getLoopArray(0, 23, '时');
  dateTimeArray[4] = getLoopArray(0, 59, '分');
  // dateTimeArray[5] = getLoopArray(0, 59);

  dateTimeArray.forEach((current, index) => {
    var copy = JSON.parse(JSON.stringify(current))
    for(var i = 0; i < copy.length; i++) {
      
      copy[i] = copy[i].replace(/[年月日时分秒]/g, '')
     
    }
    
    dateTime.push(copy.indexOf(defaultDate[index]));
  });

  return {
    dateTimeArray: dateTimeArray,
    dateTime: dateTime
  }
}

/*
 * 格式化时间
 */
function formatDateTime(fmt, date) { 
  var o = {
    "M+": date.getMonth() + 1, //月份   
    "d+": date.getDate(), //日   
    "H+": date.getHours(), //小时 
    "h+": date.getHours(), //小时   
    "m+": date.getMinutes(), //分   
    "s+": date.getSeconds(), //秒   
    "q+": Math.floor((date.getMonth() + 3) / 3), //季度   
    "S": date.getMilliseconds() //毫秒   
  };
  if (/(y+)/.test(fmt))
    fmt = fmt.replace(RegExp.$1, (date.getFullYear() + "").substr(4 - RegExp.$1.length));
  for (var k in o)
    if (new RegExp("(" + k + ")").test(fmt))
      fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
  return fmt;
}
module.exports = {
  dateTimePicker: dateTimePicker,
  getMonthDay: getMonthDay,
  formatDateTime: formatDateTime
}